use #!/usr/bin/env bash and fix doc #291
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ubuntu
❯ sh dev_init.sh
dev_init.sh: 4: Bad substitution
dev_init.sh: 12: Syntax error: redirection unexpected
我研究了下，貌似ubuntu默认sh是dash
https://unix.stackexchange.com/questions/442510/how-to-use-bash-for-sh-in-ubuntu
有多个程序实现了 的语言 /bin/sh 。在 Ubuntu 上， /bin/sh 是 dash，它被设计为快速，使用少量内存，并且不支持超过预期的最低限度 /bin/sh 。在 RHEL 上， /bin/sh 是 bash，它速度较慢，使用更多内存，但具有更多功能。其中一个功能是 [ 条件语法的 == 运算符。Dash 支持 [ ，这是一个基本的 sh 功能，但它没有作为 bash（以及 ksh 和 zsh）扩展的 == 运算符。
Since Ubuntu 22.10 and Debian 12, this is no longer supported; if you want to switch /bin/sh to /bin/bash, you’ll have to symlink it manually. See Gilles’ answer for details.
从 Ubuntu 22.10 和 Debian 12 开始，不再支持此功能;如果要切换 /bin/sh 到 /bin/bash ，则必须手动对其进行符号链接。有关详细信息，请参阅 Gilles 的回答。